Custom Filter, Search category names and speed of search

Hi,

I need to put two different search boxes on the site – which I know I can do as I’ve bought the pro version, but on one of the search boxes, I need it to ONLY search items that are on sale. Please can you tell me how I can do this. Can I (or you) create a “custom filter” to do it?

Separately, I have a category called cameras and I need the search to return all items in the category if someone types in “cameras” in the search box along with any other products that meet the search criteria.

Finally, the search is very slow with only 750 products – how can I improve the speed please. I already have cache turned on in the plugin.

Many thanks,